physica status solidi (RRL) - Rapid Research Letters

Cover image for Vol. 5 Issue 8

August 2011

Volume 5, Issue 8

Pages A83–A92, 259–300

  1. Cover Picture

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    1. Cover Picture: Nanoscale retention-loss dynamics of polycrystalline PbTiO3 nanotubes (Phys. Status Solidi RRL 8/2011)

      Hyunwoo Choi, Yunseok Kim, Seungbum Hong, Tae-Hyun Sung, Hyunjung Shin and Kwangsoo No

      Version of Record online: 3 AUG 2011 | DOI: 10.1002/pssr.201190017

      Thumbnail image of graphical abstract

      One-dimensional ferroelectric nanomaterials have attracted attention due to excellent properties compared to their bulk thin film counter parts. In the Letter featured on the front cover of this issue, Hyunwoo Choi et al. (pp. 289–291) have observed the nanoscale retention loss dynamics of polycrystalline PbTiO3 nanotubes. The cover image shows the changes of size of the nanodot domains written on the PbTiO3 nanotube. The authors found that the retention loss of the nanodot domains on the nanotube showed stretched exponential relaxation behaviors, which are similar to those of thin films (stretched exponential factor is less than one).

  2. Issue Information

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Back Cover
    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
    9. Information for authors
  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Issue Information
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    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
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    1. Back Cover: Thin film optimization design of organic–inorganic hybrids for waveguide high-rejection optical filters (Phys. Status Solidi RRL 8/2011)

      Carlos M. S. Vicente, Ramkanna Venkatachaam, Bruno M. Ferreira, Paulo G. Marques, Carlos A. F. Marques, Edison Pecoraro, Luis D. Carlos, Paulo S. André and Rute A. S. Ferreira

      Version of Record online: 3 AUG 2011 | DOI: 10.1002/pssr.201190019

      Thumbnail image of graphical abstract

      Carlos M. S. Vicente et al. (see pp. 280–282) have fabricated high-rejection optical filters based on first-order Bragg gratings which were inscribed in channel waveguides through UV-laser writing in transparent, low surface roughness (<0.1 nm), and low-loss (1.5 ± 0.2 dB cm–1, 532 nm) thin films of organic–inorganic hybrids with controlled refractive index values stable under aging. The high-rejection figure of merit (∼24 dB) of these optical filters is the best value found until now for organic–inorganic hybrids, reinforcing the potential of sol–gel technology in the fabrication of cost-effective integrated optics devices for the next generation of optical networks.

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Back Cover
    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
    9. Information for authors
  5. NEW IN pss

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Back Cover
    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
    9. Information for authors
  6. Conference calendar

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Back Cover
    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
    9. Information for authors
  7. Rapid Research Letters

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Back Cover
    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
    9. Information for authors
    1. Optical properties of dye sensitized TiO2 nanowires from time-dependent density functional theory (pages 259–261)

      Dick Hartmann Douma and Ralph Gebauer

      Version of Record online: 21 JUN 2011 | DOI: 10.1002/pssr.201105241

      Thumbnail image of graphical abstract

      This Letter presents computations of optical and structural properties of semiconductor nanowires which are sensitized by organic dye molecules. Such systems are prototypes for a new kind of solar cells. Both investigated molecules, catechol and squaraine, lead to enhanced absorption of visible light.

    2. Atomic layer deposition of TiO2 and Al-doped TiO2 films on Ir substrates for ultralow leakage currents (pages 262–264)

      Seong Keun Kim, Sora Han, Jeong Hwan Han, Woongkyu Lee and Cheol Seong Hwang

      Version of Record online: 20 JUN 2011 | DOI: 10.1002/pssr.201105250

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      Ultralow leakage currents will be a crucial requirement for the use of TiO2 as an alternative dielectric material in capacitors for future dynamic random access memory technology. Therefore, TiO2 and Al-doped TiO2 (ATO) films were grown on Ir substrate by atomic layer deposition using O3 as the oxygen source. The TiO2 films on Ir substrate showed better leakage properties than films on Ru substrates due to the higher work function of Ir.

    3. Bias-driven super-insulating state in prismane single-molecule contacts (pages 265–267)

      D. A. Luzhbin and C.-C. Kaun

      Version of Record online: 21 JUN 2011 | DOI: 10.1002/pssr.201105279

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      Transport properties of the smallest three-dimensional fullerene-like carbon cluster – prismane C8 – are studied from first principles using density functional theory and the nonequilibrium Green's functions formalism. The authors show that, with increase in the junction length, the IV curves exhibit more and more pronounced negative differential resistance, which eventually transforms into the super-insulating area, where the current through the junction is almost blocked.

    4. Engineering of YBa2Cu3O7–δ grain boundary Josephson junctions by Au nanocrystals (pages 268–270)

      P. Michalowski, M. Schmidt, F. Schmidl, V. Grosse, D. Kuhwald, C. Katzer, U. Hübner and P. Seidel

      Version of Record online: 22 JUN 2011 | DOI: 10.1002/pssr.201105228

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      In this Letter the authors show how to tune the properties of YBa2Cu3O7–δ grain boundary Josephson junctions using gold nanocrystals formed from an intermediate Au layer. The nanocrystals influence the crystalline structure and thus the properties of the grain boundaries. On a single bicrystal substrate the junctions with Au nanocrystals show a decrease of compared to those without, while the product is nearly constant. This and the possibility to adjust in determined areas offer prospects for application in magnetic field sensors.

    5. EPR evidence of antiferromagnetic ordering in single-layer graphene (pages 271–273)

      Maria A. Augustyniak-Jabłokow, Krzysztof Tadyszak, Mariusz Maćkowiak and Yurii V. Yablokov

      Version of Record online: 1 JUL 2011 | DOI: 10.1002/pssr.201105234

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      This Letter presents the first experimental evidence of the theoretically predicted antiferromagnetic ordering in single layer graphene. A qualitative agreement with theory is obvious and the reasons of the quantitative differences are discussed. The obtained results prove that the electron paramagnetic resonance (EPR) is a powerful and effective tool for study of the magnetic properties of graphene.

    6. Improved device performance in nonpolar a -plane GaN LEDs using a Ni/Al/Ni/Au n-type ohmic contact (pages 274–276)

      Dong Ho Kim, Su Jin Kim, Seung Hwan Kim, Tak Jeong, Sung Min Hwang and Tae Geun Kim

      Version of Record online: 4 JUL 2011 | DOI: 10.1002/pssr.201105265

      Thumbnail image of graphical abstract

      The authors report the feasibility of nonpolar a -plane GaN LEDs utilizing unique Ni/Al/Ni/Au n-type ohmic contacts. The proposed LED shows a lower forward voltage and a higher output power, as compared to the reference LED using the typical Ti/Al/Ni/Au n-type contact. These results imply that the optimization of the n-type ohmic contact is important to improve the performance of a -plane GaN LEDs, due to the unique surface conditions of the a -plane GaN materials.

    7. A deep level transient spectroscopy study on the interface states across grain boundaries in multicrystalline silicon (pages 277–279)

      J. Chen, E. Cornagliotti, E. Simoen, E. Hieckmann, J. Weber and J. Poortmans

      Version of Record online: 4 JUL 2011 | DOI: 10.1002/pssr.201105225

      Thumbnail image of graphical abstract

      The deep level transient spectroscopy (DLTS) technique was used to detect interface states at grain boundaries in multicrystalline silicon (mc-Si), especially on Σ3 and Σ9 grain boundaries (GBs) under as-grown conditions and after hydrogenation or gettering. Interface states are found to be comparable for both GBs in the as-grown state. Either gettering or hydrogenation reduces the recombination activity of both GBs, and the reduction for Σ3 GBs is stronger than for Σ9 GBs especially after hydrogenation.

    8. Thin film optimization design of organic–inorganic hybrids for waveguide high-rejection optical filters (pages 280–282)

      Carlos M. S. Vicente, Ramkanna Venkatachaam, Bruno M. Ferreira, Paulo G. Marques, Carlos A. F. Marques, Edison Pecoraro, Luis D. Carlos, Paulo S. André and Rute A. S. Ferreira

      Version of Record online: 4 JUL 2011 | DOI: 10.1002/pssr.201105283

      Thumbnail image of graphical abstract

      High-rejection optical filters (∼24 dB) based on first-order Bragg gratings inscribed in channel waveguides were fabricated using UV-laser writing in thin transparent, low surface roughness (< 0.1 nm), and low-loss (1.5 ± 0.2 dB cm–1) films of organic–inorganic hybrids. The high-rejection figure of merit is the highest found until now for organic–inorganic hybrids reinforcing the potential of sol–gel technology in the fabrication of cost-effective integrated optics devices.

    9. Synchrotron fluorescence nanoimaging of a single Co-implanted ZnO nanowire (pages 283–285)

      M. H. Chu, J. Segura-Ruiz, G. Martinez-Criado, P. Cloetens, I. Snigireva, S. Geburt and C. Ronning

      Version of Record online: 5 JUL 2011 | DOI: 10.1002/pssr.201105291

      Thumbnail image of graphical abstract

      Using a hard X-ray nanoprobe Chu, Segura-Ruiz and co-workers have investigated the elemental distribution in as-grown ZnO and Co implanted ZnO nanowires. Both Zn and Co elemental maps revealed a homogeneous distribution at the length scale of the X-ray beam size, without clustering or segregation effects. Within the nanoprobe spatial resolution, our findings indicate cobalt localization within thicker irregularities observed by scanning electron microscopy.

    10. Large-area p-type HIP-MWT silicon solar cells with screen printed contacts exceeding 20% efficiency (pages 286–288)

      Benjamin Thaidigsmann, Elmar Lohmüller, Ulrich Jäger, Sebastian Mack, Friedrich Lottspeich, Alma Spribille, Katrin Birmann, Denis Erath, Andreas Wolf, Florian Clement, Daniel Biro and Ralf Preu

      Version of Record online: 6 JUL 2011 | DOI: 10.1002/pssr.201105311

      Thumbnail image of graphical abstract

      The implementation of high-efficiency structures in solar cell designs is usually accompagnied by an increase in process complexity. In this Letter, a simplified cell structure is presented that synergistically combines surface passivation with the metal wrap-through approach resulting in peak efficiencies of 20.2% for large-area monocrystalline p-type silicon solar cells.

    11. Nanoscale retention-loss dynamics of polycrystalline PbTiO3 nanotubes (pages 289–291)

      Hyunwoo Choi, Yunseok Kim, Seungbum Hong, Tae-Hyun Sung, Hyunjung Shin and Kwangsoo No

      Version of Record online: 6 JUL 2011 | DOI: 10.1002/pssr.201105243

      Thumbnail image of graphical abstract

      The authors observed the nanoscale retention loss dynamics of polycrystalline lead titanate nanotubes. The retention loss of the nanodot domains on the nanotubes show stretched exponential relaxation behavior which is similar to that of thin films (stretched exponential factor less than one). These results suggest a possible application of ferroelectric nanotubes for three-dimensional non-volatile memory devices.

    12. Direct synthesis of luminescent SiC quantum dots in water by laser ablation (pages 292–294)

      Yu. Zakharko, D. Rioux, S. Patskovsky, V. Lysenko, O. Marty, J.-M. Bluet and M. Meunier

      Version of Record online: 7 JUL 2011 | DOI: 10.1002/pssr.201105284

      Thumbnail image of graphical abstract

      In this Letter, the fabrication of luminescent SiC quantum dots by means of laser ablation is described. The figure shows a transmission electron microscopy image of the formed quantum dots. The presence of particles with sizes of less than 5 nm is clearly visible. A zeta-potential measurement of the obtained colloidal solutions confirms the high stability of the nanoparticles.

    13. Vacancy growth and migration dynamics in atomically thin hexagonal boron nitride under electron beam irradiation (pages 295–297)

      Nasim Alem, Rolf Erni, Christian Kisielowski, Marta D. Rossell, Peter Hartel, Bin Jiang, Will Gannett and A. Zettl

      Version of Record online: 11 JUL 2011 | DOI: 10.1002/pssr.201105262

      Thumbnail image of graphical abstract

      Defects can modulate the electronic properties of crystals by introducing empty states within their band gap. When exposed to chemical functional groups, they can trap molecules and adatoms and significantly change the electronic and sensing properties of the crystal. The authors investigate the mechanisms behind formation and migration of vacancy defects in atomically thin hexagonal boron nitride (h-BN) membrane using ultra-high resolution aberration corrected electron microscopy. This investigation shows fascinating interaction dynamics between the vacancies and step edges in h-BN with the adatoms and molecules.

    14. Contact passivation in silicon solar cells using atomic-layer-deposited aluminum oxide layers (pages 298–300)

      Dimitri Zielke, Jan Hendrik Petermann, Florian Werner, Boris Veith, Rolf Brendel and Jan Schmidt

      Version of Record online: 13 JUL 2011 | DOI: 10.1002/pssr.201105285

      Thumbnail image of graphical abstract

      Atomic-layer-deposited aluminum oxide (AlOx) was implemented as a passivating layer between the n+-emitter and the Al contact on the front side of passivated emitter and rear silicon solar cells. For the optimal AlOx thickness the authors of this Letter achieved an independently confirmed energy conversion efficiency of 21.7% and a Voc of 673 mV. An increase in AlOx thickness leads to a decreasing tunneling probability.

  8. Information for authors

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    2. Cover Picture
    3. Issue Information
    4. Back Cover
    5. Contents
    6. NEW IN pss
    7. Conference calendar
    8. Rapid Research Letters
    9. Information for authors

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